Ok , I am doing this for those that don't want to go brass. This tossed together from the scrap box, and I mean scrap box! The wheels are Eldon, perfect match for the kit wheels and tire sizes. the chassis is a narrow 3d plastic thing with a short guide mount. I bored the brass collars to 1/8 inch, and drilled the front perch the same size. toss in a slimcan and an old cox gear, and you have a roller for your AU kit!
Im sure it could be weighted and tweaked to run ok, but im still building a brass chassis for this one. just thought I would share the idea.